<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Ripple Effect</title>
<style>
  .ripple {
    position: relative;
    width: 200px;
    height: 200px;
    background: #3498db;
    border-radius: 50%;
    overflow: hidden;
  }
 
  .ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 15px;
    height: 15px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    animation: ripple-animation 2s infinite;
  }
 
  @keyframes ripple-animation {
    to {
      opacity: 0;
      transform: translate(-50%, -50%) scale(10);
    }
  }
</style>
</head>
<body>
 
<div class="ripple"></div>
 
</body>
</html>